S355 is a structural micro-alloyed grade used for a great variety of applications. It is standardized with a specified impact strength of 27 J at a few different temperatures, but EN10027 gives guidelines how to extend the designation.
Chemical composition
| Variant | Cast | Weldability | C % | Si % | Mn % | P % | S % | Cu % | N % | |
|---|---|---|---|---|---|---|---|---|---|---|
| S355JR / 2132 | CC | CEV 0.52max | Min | - | - | - | - | - | - | - |
| Pcm 0.35max | Max | 0.24 | 0.55 | 1.60 | 0.040 | 0.040 | 0.40 | 0.0120 | ||
| S355JR EN10025-2:2019 | Std | CEV 0.52max | Min | - | - | - | - | - | - | - |
| Pcm 0.35max | Max | 0.24 | 0.55 | 1.60 | 0.035 | 0.035 | 0.55 | - |
Mechanical Properties
| Variant | Condition | Format | Dimension [mm] | Yield strength min [MPa] | Tensile strength [MPa] | Elongation A5 [%] | Hardness | Impact (ISO-V) strengthmin |
|---|---|---|---|---|---|---|---|---|
| Rp0.2 * Reh, ** Rel | ||||||||
| S355JR / 2132 | +AR | Flat bar | < 16 | 355** | 470-630 | 22 | 140-190 HB | 20 °C 27 J (long) |
| Flat bar | 16 < 40 | 345** | 470-630 | 22 | 140-190 HB | 20 °C 27 J (long) | ||
| Flat bar | 40 < 63 | 335** | 470-630 | 21 | 140-190 HB | 20 °C 27 J (long) | ||
| Flat bar | 63 < 80 | 325** | 470-630 | 20 | 140-190 HB | 20 °C 27 J (long) | ||
| Flat bar | 80 < 100 | 315** | 470-630 | 20 | 140-190 HB | 20 °C 27 J (long) | ||
Transformation temperatures
| Temperature °C | |
|---|---|
| MS | 540 |
| AC1 | 720 |
| AC3 | 790 |
Other properties (typical values)
| Youngs module (GPa) | Poisson´s ratio (-) | Shear module (GPa) | Density (kg/m3) |
|---|---|---|---|
| 210 | 0.3 | 80 | 7800 |
| Average CTE 20-300°C (µm/m°K) | Specific heat capacity 50/100°C (J/kg°K) | Thermal conductivity Ambient temperature (W/m°K) | Electrical resistivityAmbient temperature (µΩm) |
| 12 | 460 - 480 | 40 - 45 | 0.20 - 0.25 |
